Quand la douleur est forte, je vais voir le médecin.

Quand means when. It introduces a time clause: Quand la douleur est forte = When the pain is strong / when the pain gets bad.

In French, quand is commonly used just like when in English:

• Quand je suis fatigué, je me repose.
• Quand il pleut, nous restons à la maison.

So in this sentence, it sets up the situation in which the action happens.

French usually needs an article before nouns, where English sometimes does not. So la douleur literally means the pain.

French often uses:

• le / la / les for general ideas
• where English may simply say pain, music, life, etc.

So la douleur est forte is a natural French way to say the pain is severe or the pain is bad.

Both are possible in French, but they are used a little differently.

• J’ai mal means I’m in pain / it hurts
• La douleur est forte focuses more on the intensity of the pain

So this sentence sounds a bit more descriptive or formal. It is talking about pain almost as a condition:

• Quand la douleur est forte... = When the pain is severe...

A more everyday version might be:

• Quand j’ai très mal, je vais voir le médecin.

Both are correct, but the original sentence sounds slightly more general or medical.

Forte agrees with la douleur, which is a feminine noun.

• douleur is feminine
• so the adjective must also be feminine:
  • masculine: fort
  • feminine: forte

This is a basic French agreement rule:

• un homme fort
• une douleur forte

So la douleur est forte means the pain is strong/severe, with the adjective matching the noun.

Because forte is not directly next to the noun here. It comes after est, which is a form of être.

Structure:

• la douleur = subject
• est = is
• forte = adjective describing the subject

So this is like:

• The pain is severe

This is different from:

• une forte douleur = a severe pain

Both are correct:

• La douleur est forte = the pain is severe
• une forte douleur = a severe pain

Yes. Je vais voir le médecin literally means I go to see the doctor.

Here:

• vais = go (from aller)
• voir = to see
• together, aller voir means to go see

This is a very common French structure:

• Je vais voir mes parents. = I’m going to see my parents.
• Elle va voir un spécialiste. = She’s going to see a specialist.

So je vais voir is not future here. It is the normal present tense of aller + infinitive voir, meaning I go to see or I go see.

Yes, in some contexts aller + infinitive can express the near future:

• Je vais voir le médecin demain. = I’m going to see the doctor tomorrow.

But in this sentence, because of Quand la douleur est forte, the meaning is more habitual:

• When the pain is bad, I go see the doctor

So here it is best understood as a repeated or usual action, not a future plan.

French often uses the present tense to express:

• habits
• general truths
• repeated actions

This sentence describes what someone usually does:

• Quand la douleur est forte, je vais voir le médecin.
• When the pain is bad, I go see the doctor.

English does the same:

• When I’m tired, I sleep
• When it rains, we stay inside

So the present tense is the natural choice for a habitual situation.

Both can be possible, but they suggest slightly different things.

• le médecin = the doctor
  • often means the doctor in general, the doctor I would normally see, or simply the doctor as a role
• un médecin = a doctor
  • emphasizes any doctor / one doctor

In many general statements, French often uses le / la where English might also use the or sometimes a more general expression.

So je vais voir le médecin sounds natural if the idea is I go to the doctor.

The comma separates the introductory quand clause from the main clause.

• Quand la douleur est forte, = introductory time clause
• je vais voir le médecin. = main clause

This works much like English:

• When the pain is severe, I go to the doctor.

The comma makes the sentence easier to read. In French, this is common when the subordinate clause comes first.

Yes. You can also say:

Je vais voir le médecin quand la douleur est forte.

This means the same thing overall. The difference is mostly about emphasis:

• Quand la douleur est forte, je vais voir le médecin.
  Focuses first on the condition.
• Je vais voir le médecin quand la douleur est forte.
  Starts with the main action.

Both are grammatical and natural.

Yes. French commonly uses fort / forte in situations where English often prefers strong, bad, or severe, depending on context.

So:

• la douleur est forte literally = the pain is strong
• but more natural English = the pain is severe or the pain is bad

This is a good example of where French and English use slightly different adjective habits. French learners should not translate word-for-word too rigidly here.